at91_smc.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2014 M. Warner Losh.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: stable/11/sys/arm/at91/at91_smc.c 330897 2018-03-14 03:19:51Z eadler $");
30
31#include <sys/types.h>
32
33#include <arm/at91/at91reg.h>
34#include <arm/at91/at91_smc.h>
35#include <arm/at91/at91sam9260reg.h>
36
37/*
38 * RD4HW()/WR4HW() read and write at91 hardware register space directly. They
39 * serve the same purpose as the RD4()/WR4() idiom you see in many drivers,
40 * except that those translate to bus_space calls, but in this code we need to
41 * access some devices before bus_space is ready to use.  Of course for this to
42 * work the appropriate static device mappings need to be made in machdep.c.
43 */
44static inline uint32_t
45RD4HW(uint32_t devbase, uint32_t regoff)
46{
47
48	return *(volatile uint32_t *)(AT91_BASE + devbase + regoff);
49}
50
51
52static inline void
53WR4HW(uint32_t devbase, uint32_t regoff, uint32_t val)
54{
55
56	*(volatile uint32_t *)(AT91_BASE + devbase + regoff) = val;
57}
58
59
60void
61at91_smc_setup(int id, int cs, const struct at91_smc_init *smc)
62{
63	// Need a generic way to get this address for all SoCs... Assume 9260 for now...
64	uint32_t base = AT91SAM9260_SMC_BASE + SMC_CS_OFF(cs);
65
66	WR4HW(base, SMC_SETUP, SMC_SETUP_NCS_RD_SETUP(smc->ncs_rd_setup) |
67	      SMC_SETUP_NRD_SETUP(smc->nrd_setup) |
68	      SMC_SETUP_NCS_WR_SETUP(smc->ncs_wr_setup) |
69	      SMC_SETUP_NWE_SETUP(smc->nwe_setup));
70	WR4HW(base, SMC_PULSE, SMC_PULSE_NCS_RD_PULSE(smc->ncs_rd_pulse) |
71	      SMC_PULSE_NRD_PULSE(smc->nrd_pulse) |
72	      SMC_PULSE_NCS_WR_PULSE(smc->ncs_wr_pulse) |
73	      SMC_PULSE_NWE_PULSE(smc->nwe_pulse));
74	WR4HW(base, SMC_CYCLE, SMC_CYCLE_NRD_CYCLE(smc->nrd_cycle) |
75	      SMC_CYCLE_NWE_CYCLE(smc->nwe_cycle));
76	WR4HW(base, SMC_MODE, smc->mode | SMC_MODE_TDF_CYCLES(smc->tdf_cycles));
77}
78
79void
80at91_ebi_enable(int bank)
81{
82
83	WR4HW(AT91SAM9260_MATRIX_BASE, AT91SAM9260_EBICSA, (1 << bank) |
84	      RD4HW(AT91SAM9260_MATRIX_BASE, AT91SAM9260_EBICSA));
85}
86
87void
88at91_ebi_disable(int bank)
89{
90
91	WR4HW(AT91SAM9260_MATRIX_BASE, AT91SAM9260_EBICSA, ~(1 << bank) &
92	      RD4HW(AT91SAM9260_MATRIX_BASE, AT91SAM9260_EBICSA));
93}
94